For all the bad press about US inequality (and our health insurance system is a disaster) and for all our right-wing politics (the two-party system allows the authoritarian/psychotic 30% that every country has to gain a major foothold; EU loonies and racists are split between left and right but ours have been successfully corralled to right and "the base" of a major party) I will actually go on record to say that, at heart, Americans aren't very elitist or classist.
In other countries where the rich are held to be simply better people, and act with impunity, the rules are very different. See, the Midwestern neurosurgeon in the US is, in technical terms, not a fucking prick, so he doesn't mind sharing the lounge with a guy who bought a day pass. On the other hand, some lieutenant for a third-world despot, or some unionbusting murderer in a Chinese factory, is going to be pissed if he finds out that someone from economy class was let in to the lounge. So overseas, in countries where the rich are just a lot worse, a lot of lounges have no-day-pass policies.
You can bribe your way in, but that's icky. I have no problem with cheating a large corporation, but foreign airlines are pretty awful to lounge agents who are caught taking bribes.
Edit: please don't correct actual life experience with a quote from Wikipedia.
United Club is the name of their "first class" lounge, as people incorrectly refer to them. Those United Club Lounges have complimentary booze [1]. And no airline is going to allow a passenger to board who had obviously consumed the amount of alcohol you're referring to. I know: I practically lived at the T3 United Club lounge at O'Hare for many years, I was traveling so much. Not as much any more, but when I've been delayed significantly and I'm super-stressed because I'm speaking at a conference or something, I still occasionally get a day pass.
The United lounges you're referring to are considerably more elite, and most travelers don't even know they exist. Again, taken from actual experience and not a quick perusal of a Wikipedia article.
American's "Admiral's Club" [2] no longer offers complimentary liquor.
[1] http://www.united.com/web/en-US/content/travel/airport/loung...
[2] https://www.aa.com/i18n/travelInformation/airportAmenities/A...
If you read the wikipedia page http://en.wikipedia.org/wiki/United_Club it says you can buy access to United Club, but doesn't say that about the first class lounge. In fact it says:
"the access rules are significantly more restrictive than for United Club. Access to Global First Lounges is generally restricted to United Global First passengers, Star Alliance First Class customers, and Global Services passengers confirmed in Business Class."
In the first class lounge you get free food and drink including alcohol. If you could really get in for $50 a day, you could easily eat and drink that much worth.
Or just get an American Express card (Platinum, ideally - no additional fees) and net access to the Centurion lounge and all Delta lounges (when flying Delta).
The Centurion lounge is second-to-none domestically, and the Delta lounges aren't half-bad when it comes to the free booze (some are self-serve - Jack Daniels, Grey Goose, etc.)
United's clubs are a joke comparatively.
And they haven't reduced the fee even while losing Continental lounges when it was bought by United.
For my money, the Citi AAdvantage Executive card is a better similar card, because it now gives you access to all AA and USAirways lounges. While you're right that in my experience the Delta lounges are better (the only amex lounge I've been to is at mccarran), what matters most to me is a lounge in the cities i connect thru.
The Citi card is the same AF as the Amex Plat but Plat has policy of never waiving first year AF and Citi often has a promotion doing just that (or a portion of).
No need to pay $50 a day, just buy a fully-flexible first class ticket and keep re-scheduling it:
http://timesofindia.indiatimes.com/world/mad-mad-world/Chine...
GS is a special invite status reserved for celebrities and high ranking politicians. My assumption is that they need that space so that they can load the person from the tarmac or have them check out of the airport. Thats speculation, but those individuals do have different needs from an airline. [Also onboarding needs as well as that they don't enter from the jetway]
I started using airport lounges when I joined LoungeBuddy (since I had no idea it's even a thing worth checking out before), and it's definitely is a much better experience.
(disclosure - I do iOS work at LoungeBuddy and we pretty much have all the information on all the lounges on the entire planet, including access rules and entry price of they offer walk ups etc. http://www.loungebuddy.com/ )
You can also buy the membership, or apply for the credit card that gets you the membership as a miscellaneous benefit.